I've been playing games since Pong first came out. I've always been intrigued by the ability of people to make silicon chips make sound and pictures, and later tell stories. I've owned and worked in many arcades until I was 32, and then worked regular adult work but still played games.
I got Deus Ex free with a video card purchase, and that just blew my mind. I couldn't believe it! There was a story! Voices! There even was a helicopter that looked pretty real, especially when taking off. There was also ray-traced graphics, prerendered of course. I discovered that in different playthroughs I could play and finish the game in several different ways. I've loved action RPGs and story-heavy games ever since. I don't like the turn-based games, or the top-view games. When Deus Ex: Invisible War came out I had to buy another video card to handle the green fog. I was disappointed in that game.
But still I play, at 64. Some series are great (The Witcher and Mass Effect) and some series have mixed great and not-so-great games in them (Dragon Age, Crysis, Far Cry, and Mass Effect if you count Andromeda). It doesn't matter, though, because people like all kinds of video games, and table top games, and casual games, etc.
As for the maturity aspect of playing games, it's moot. It's an experience I enjoy. I also enjoy reading, but I don't see how that's more mature. I read a story, or novel, and I'm done with it. I don't read books over and over or see movies more than once, because the experience doesn't change enough, because the story doesn't change at all.